1-Day Project: Build Your Own Arduino Uno for $5

Clones of the popular Arduino Uno are now so cheap, it’s difficult to save money by building your own. But the knowledge gained from assembling an Arduino from individual parts, makes the exercise well worthwhile. ATmega328P Pin Mapping: ATMEGA328P-PU Microcontrolle​r With ARDUINO UNO Bootloader good quality via @eBay 5PCS Solderless Prototype Breadboard 170 Tie-points